Marsh



E. A. MARSH.

COMPENSATION BALANCE DEMONSTRATOR.

APPLICATION FILED MAN. 3, I9 15.

1,149,847. Patented Aug. 10,1915.

Jfuuewlor (LC/{112,71 688%: 3/ M 19550 rngy- CDLUMBIA PLANDGRAPH C0.,WASHINGTON, n c.

is s entail ,hQld l et-balm- ,sa it h higgalipi e iia Hie heating instrumentality may be located. The invention is also embodied in an apestates organized asabovej iifiiicated and incliidiiig a mm euna pemser, one member of which is said finger, While the other memher is pivoted and engaged with thei'free end ger the arrangement be ng stfchf I l that an mpiified'expansion or contraction indicating movement is,zimparted to :the

pivoted member. w ifltithe'akzicompanymg drawings iorm ng: a

' part =-of=:this specification --Figure- 1 reprelse'lrts a top .plamview of a demonstrator em- --btdyiamg fiheJinventionmFig; represents a side view iozfisthe samef Fig E3? represents ienlahagdisrtiononeline (if-Fig. 1 g. Fig.

4 representswan hnl-arged seetiombn' line ofrlFig; 1'; Fig; 5: represents a1 plan view .of :therheat rcbnduetingr bed plate hereinafter referred ton-Fig.- :6 rep resents a fragmentary nm v'iewr' showing a: -modi-fieation; 1*?1g.*;7 represent a:-. sectional view of: :aL' su table 'itorehrdioih heating; the balance, and a liquid finelui'eserveiriin whioh--the';same may be.

stolied' iwhdn notfin'use'z I r The sameii'eference characters Indicate the 1 'samei'or'simiiaripartsvin fllllthE-VlGWS;

-ln ithe drawings, 1-2 represents apreferably circular base adapted wrest on atable or otherhorizontal slipport' and bearing an n right standerd'13 preferably circular an-d o? smw-Her diameter than the-base. I

The standard and base siipporti an: elongated' arni vvhi'ch'projects a considerable distanbe frdm' one.=sid'e ofthe standard-end base, ax-aid overhangs an unobstructed space in which a, heater such as an alcohol lam-p thickness ofthe' arm' rn-ember "15, 'isorthat theeinner! inerginibf'thering 15 'forins th marginlref-xe' cirenlar recess -int which is cleeiy fitted a' oirou-lari dial: =17 on which is inscri'hed 'an arouate scale 17*. Said? dial may-'be'pre'vided with studs or feet-assimiltr te t he feet' 'of a -watch "dial, inserted" socketsinthehead '14 and secured by c1am me sar ewsna The m ter end of the arm yffovided vfithnieansior holding a compens eomenme o'f ordifia and eon-1 trnoionwconrpesed of the usnalieentra'lly re e t d rpseb i etm rgthe u ual a QQ'andta linh'f ee t ligish'lg fimsla-ild laminated segments '21, set attacfiedtt one end to one of the arms 2-0, said holding means being formed and arrangedto support at 'ldaist one of the segments ofthe balanee in -posftion to he heated hy heater located in the space under theaf'mmember 15, and permit said i g l lltii expand and Qli-r m l Thepreferred form of said holdiiig' meahs mayhe'deseri'bedL-as follows: The outer end of the arm member 15 is provided with a oircular opening or orifice lfifltb'e diameter of which is somewhat kgreater' than; that of ithe vzloalaince, :salid: orifice*beimgnsi1rnounded by a depressed I annular, :seat- 15?, formed-wort the upper side c' f-.-the arm member: 15 and :sn-rrounded by 5 an annular ishouldrer 159. 1 I 22 represents a; thinumetal bed; Tplate *Ol'ndlfik formed to substantially geover therorifioe :15 and bear-Ion ;the :seat Marthe-- pl-ate being firlnl'y :secnre'dantlpreviented izfironi turning. w

The margin of .the :plate :22 is preifierably provided withmotehes 22 0f suffieientdepth to form heat oonduoting passages; arranged in! a circular series coinciding with the''seg- |ments=ofthe balance. 5

{The pl'ate:22 is provided centrallyswithan orifice-22 (,Eig.5 i adapted-to reeeive a screw 24 which enters the-central? orifice 'in athe'hub portion of theabalanoe airms; 1Th'e screw is providedzwitha fnut 25 which-hears on the under side-inf the plate 22 and c0- operates the head I ofathe' screw 24: in the balance arms to the plate;

leaving the balance-segments 'free to expand amdoontraetr 1w; a 26 represents-qh=-.narrow elongated finger attached migidly' at bneiend'biy a sdrew 26 to one: :oithe balance segments, andl-projeoting therefrom over the arm membeirid-iaSaid finger has thefgeneiial -eh'araeteristics as to material and: :form lof alielnele hand wandris supported-r 'wc holly by zthei segment "to 5 which it-is attaehed,- and moved 'liaterally over' the arm member 15, :by' movements ofufihe'f sg ment aused lbyiexpansio'n' andicontraet-ion, vi

the; length of the? finger? such-that movements of :--fr.ee; end; :are' i or 1 Fmnch greater amplitude than thfose'of theibalanoe segment, so Ethatl when the segment :is miiized by the-notion ofiheatlupon -it,:-althmigh the relatively slight t movement of the segment is hardly discernible by-tlie-eye; the ire snlb iii-g: movement of'th'e finger; relativelyf'to the portion of the-armlover which it"projects can-beiplazinlydiscerned.- The finger :may 1 eonstimtei'the only pointingor indicating instrumentalityz prefer however tointi line the? fingeraswaz member; for a z cnmponnd pointer; the r. other :menihenof- Evthihh' is a relativelyoshort itwnearni'ed "pointer'rmember 275' preferably formed like the sef sond s hia-n'd: ozf a'wvat'e'h'and attached toz-a zsfiafi 28;;Whi6h: is jonrii aled'i in heariitgs -29 will) a- 5 itubu-lar heldev 1 1- insertedsin :-.a@: seeket :fcr med ter its .reeeptioni- :theestamda; EEhe staftis lsie t d a,t;the entes .e fithi. daal- .12; 1 and-pmieets throngathe eiltralzerifiee; of? the dial I lot; in thegme n enfitl; flI-he movemen s of tha tee endmt the-member; 26am I theretere ransmit ed k a th member 27 i the anger atathet atter mamas a eonsi ta ly greater lateral movement-ithan thefree iend t. .the'membea fia Ilia membersflfitand 'r may? be qt te mise .eonne teiitae lea-s w Se meet z tyt2ap est-0n: t e" m e a enda a .Sh W. ;hy--F1gefiai es?! 'bs fappa a u ilsanotiat nded del te. qw eas e ties. .to aseettaim e .exaat esre set ea Baa lon a d; e nt aet cn ofwba a ee; under itench sesrof.temretatat t yobie t he I in to de on ra equ escent-convi c ngly n ma -mutant nay-(and. ,bath ai f at a simple heater, 7 such ,as San, ralcohol. lamp 501; t mb the ti h the' m ot th segments. of. watch, balancais ,variedbysn d-. den increments of heat The described construction is preferably such thatthe balance supporting arms must be-heldisubstantially horizontal position in thepatlrgof heat or hot air rising from the heater, the heat .-etiaagsqui kla.. hreughtlaesthiiabeitplateau: a segment of the balance; Hence the b'alnnceand pointer have no tendency to move by gravity during the demonstrating operation, so that the balance may be secured to the holder at its center only by means such as the screw 24 and nut 25, said means offering no obstruction to the direct action of heat on the pointer-carrying balance segment. The balance constitutes a permanent part of the demonstrator.

I have shown by Figs. 2 and 7 a suitable form of torch for heating the balance, said torch including a cup 34 containing an absorbent filling 35, preferably of asbestos, a stem 86, and a base 37. The capacity of the cup is such that it will hold a limited quantity or charge of liquid fuel, such as alcohol, sufficient to heat the balance only long enough for the desired demonstration, the

flame expiring before it has had time to injuriously heat the balance and the holding means.

The base 37 is preferably formed as a cover or plug adapted to be screwed into the mouth of a fuel reservoir 38, the torch, being placed in an inverted position in said reservoir, as shown by Fig. 7, and absorbing a charge of fuel. When the torch is removed from the reservoir, placed upright under tiaecbailanceias-showmhy Fig.2, and ignited, thafiame' is s read: byathe nut 25 and acts am the bediphtez 55511534 thro gh: e, latter one th balance -tie duration at e: flame in '3 1 I 1 1 s 1:3 ...ea-reser om 5 811113 eifihQ a-wl'tll the armsatua-ia abet, amer ien 39 etwhich. 5 b dat edalinesin Rig-1e a aaeaaer nw n iea; 1. laim: 2 'AQIIPFHISMII; anaaqaaaaioa demonst ator. comm-isms a; ompensat ba ance h ving segme tsizan e engete rmhavmg balaneewhe d ng 'wiaeans eoafin n'g a :PortiQIl of the balance at one side of. thearm and emma a on se men t to expand andre tnaet, said; e ongat de m beans iaeapt iiwtel. he hel r n ly .aad mea wi h. 'eana p rmit in a t0 ae endwtrem -a@-pein b low the mn -impasse a Saids gm nt w n the arm 'is eld hqria a ale wl and an e enga ed fi g a teehedaas id; segm nt: d pmiec th re tremeevet sa a e ongatediana-w e m siqaan z l'EQQtiQI dem n: a. t- -comp yis na E eeepens oa b l n e avin se me ts ne onaa a m. ha ing an spe ng; o g etd meten than the alance, a; thin, bed plate secured. in saidopen? ng and: suppe ti-ngi the bala ea s se-r u ing thacentewf the balance the center ofthe' bed plate, the'gunder; sid'e ofithe plate thepathof heat risingfror a heatll 1. .1 .5 umentali located I below. the arm, and-an elongated-finger attached tqrsaid seg-f ment and projecting therefrom over said arm. 1 3. expansion eandacontraction "demon.-

stratar comprising a compensation balance aving segments, an elongated arm having an opening of greater diameter than the balance, a thin bed plate secured in said opening and supporting the balance, means securing the center of the balance to the center of the bed plate, leaving the segments free to expand and contract, and an elongatedfinger attached to a segment of the balance and projecting therefrom over said arm, the bed plate being provided with heatconducting openings coinciding with said segment, and permitting heat ascending from the under side of the elongated arm to impinge on said segment.

4. An expansion and contraction demonstrator comprising a compensation balance having segments, an elongated arm having balance-holding means confining the center of the balance and leaving the segments free to expand and contract, said elongated arm being adapted to conduct heat ascending from a point below it to a segment of the balance, and an elongated finger attached to said segment and projecting therefrom over said arm, the arm being provided with sup porting means arranged to support the balance-holding means over a space in which said heating instrumentality may be located. 

